[U-Boot] [PATCH 5/6] sunxi: video: Give hotplug-detect (hpd) signal some time to show up

[B.R. Oake]

On 20/12/14 14:42, Hans de Goede wrote:
> When using a hdmi powered hdmi to vga dongle, and cold booting a sunxi
> device, the hpd detect code would not see the dongle (until a warm reboot),
> because the dongle needs some time to boot.
> 
> Testing has shown that this dongle needs 213ms to respond on a cold boot,
> so wait up to 300ms for a hpd signal to show up before giving up.

Hi Hans,

I'm using a similar convertor but it sometimes takes longer to be ready,
depending on what screen is connected.  With an old VGA monitor, I've seen
it take up to 1230ms before returning the HPD signal, presumably while it
collects information from the monitor.

Would it be acceptable to increase the wait from 300ms to about 1500ms?

Thank you very much for all your work these past months on developing the
display support and getting it into mainline.  I greatly appreciate it.

Best wishes,
B.R. Oake.


P.S. The convertor I'm using is from Cable Matters:
http://www.cablematters.com/pc-428-79-cable-matters-active-hdmi-to-vga-male-to-female-adapter.aspx